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nilai max =
9 =
9 =
-36(t - 3) = 4t² - 20t + 60
-36t + 108 = 4t² - 20t + 60
0 = 4t² + 36t - 20t - 108 + 60
0 = 4t² + 16t - 48
0 = t² + 4t - 12
0 = (t + 6)(t - 2)
t + 6 = 0 atau t - 2 = 0
t = -6 atau t = 2
untuk t = 6
f(x) = (-6 - 3)x² + 2(-6)x + 5
f(x) = -9x² - 12x + 5 -------> sumbu simetri =
= -
= -
= -
untuk t = 2
f(x) = (2 - 3)x² + 2(2)x + 5
f(x) = - x² + 4x + 5 -------> sumbu simetri = -
= -
= -
= 2
jadi,sumbu simetrinya adalah - dan 2